Abstract
The study of Zostera noltii Hornem. under stressed conditions in an estuary in southern Spain gives evidence that this seagrass can tolerate high light intensities without damage to its pigment pool. Therefore, photosynthesis at high light intensities remains as intense as at saturation point and it is sustained principally by Photosystem I. The existence of a short-term pigmentary response (60 min) was evidenced and the relationship between assimilation rates and the pigment pool was established. Comparisons made with Z. marina L. and between the respective environmental characteristics of both plants suggests that the special adaptive photosynthetic performance of Z. noltii can be supported by a C 4-type metabolism.
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